The participants in the 2010 study Australia - CSIRO. China - Wuhan Institute. USA (Minnesota Medical School). https://link.springer.com/article/10.1007/s00705-010-0729-6?fbclid=IwAR3yNfuHykjJbuDGMNqfo6eEFAZ5IqJ_KE9dgcrspGn4xdRQDFBYR8y4MP4#author-information **Covid-19 has a grandma, grandpa and great grandpa. Where are they?** https://indianpunchline.com/covid-19-has-a-grandma-grandpa-and-great-grandpa-where-are-they/